Biometric study of the optic canal during cranial development.

Area of Science:

• Anatomy
• Craniology
• Developmental Biology

Background:

• The optic canal is a crucial anatomical structure transmitting the optic nerve.
• Understanding its dimensions and symmetry is vital for diagnosing and managing various ophthalmic and neurological conditions.

Purpose of the Study:

• To investigate the dimensional changes and symmetry of the optic canal throughout human cranial development.
• To provide normative data for optic canal dimensions across fetal, childhood, and adult age groups.

Main Methods:

• Casting of 146 optic canal models from 51 dry skulls and 22 individual bones.
• Measurement of orbital and cranial opening diameters and canal length using a digital caliper.
• Categorization of specimens into three age groups: fetuses, children, and adults.

Main Results:

• Significant increase in optic canal cranial opening diameter from fetal to adult stages (p < 0.001).
• Orbital opening diameters increase during fetal and childhood periods, stabilizing in adulthood.
• Optic canal length increases between childhood and adulthood.
• A significant finding of greater right than left optic canal diameter on the orbital side.

Conclusions:

• The optic canal undergoes significant dimensional changes during cranial development, particularly in its cranial opening.
• While generally symmetrical, a slight asymmetry favoring the right orbital diameter was observed.
• These findings contribute valuable data for understanding normal cranial development and potential pathologies.